Current report filing

Note 13 - Subsequent Events (Details Textual)

v3.19.1
Note 13 - Subsequent Events (Details Textual) - USD ($)
 3 Months Ended 5 Months Ended 9 Months Ended 11 Months Ended 12 Months Ended 14 Months Ended
Jun. 08, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 11, 2019
Mar. 11, 2019
Dec. 31, 2017
Dec. 31, 2018
May 30, 2018
Mar. 28, 2018
Oct. 27, 2017
Payments of Stock Issuance Costs   $ 5,000 $ 21,000                
The 2018 ATM Offering [Member]                      
Stock Issuance Program, Authorized Amount                   $ 30,000,000  
Proceeds from Issuance of Common Stock, Net   $ 3,697,000                
The 2018 ATM Offering [Member] | Subsequent Event [Member]                      
Stock Issued During Period, Shares, New Issues           4,162,964          
Shares Issued, Price Per Share         $ 2.70 $ 2.70          
Proceeds from Issuance of Common Stock           $ 11,230,000          
Proceeds from Issuance of Common Stock, Net           $ 10,900,000          
Stock Issuance, Percent of Cash Commission to Issuer         3.00% 3.00%          
The 2017 Purchase Agreement [Member]                      
Stock Issuance Program, Authorized Amount                     $ 15,500,000
Stock Issued During Period, Shares, New Issues   3,200,000         357,143        
Shares Issued, Price Per Share   $ 2.77   $ 2.77              
Proceeds from Issuance of Private Placement, Net   $ 8,900,000         $ 324,000        
Proceeds from Issuance of Private Placement       $ 9,400,000     $ 500,000        
The 2017 Purchase Agreement [Member] | Subsequent Event [Member]                      
Stock Issued During Period, Shares, New Issues           20,310,953          
Shares Issued, Price Per Share         $ 3.02 $ 3.02          
Proceeds from Issuance of Private Placement, Net           $ 6,140,000          
Proceeds from Issuance of Private Placement               $ 15,500,000      
The 2018 Purchase Agreement [Member] | Subsequent Event [Member]                      
Stock Issuance Program, Authorized Amount                 $ 20,000,000    
Stock Issued During Period, Shares, New Issues 170,261       4,167,502            
Shares Issued, Price Per Share         $ 1.90 $ 1.90          
Proceeds from Issuance of Private Placement, Net         $ 7,930,000            
The 2018 Purchase Agreement [Member] | Subsequent Event [Member] | General and Administrative Expense [Member]                      
Payments of Stock Issuance Costs $ 600,000